The green building landscape is rapidly evolving, and 2025 is shaping up to be a pivotal year for developers navigating tax policy. Federal and state governments are doubling down on incentives designed to accelerate sustainable construction, reduce emissions, and boost energy efficiency. For developers and builders, this presents a unique opportunity to not only lower their tax liabilities but also align with long-term market and environmental trends.
But there’s also a twist: the One Big Beautiful Bill Act (OBBBA) has now significantly altered the landscape of energy-focused tax incentives—repealing some, reshaping others, and expanding a few. These changes, layered atop the Inflation Reduction Act’s (IRA) green subsidy structure, introduce both opportunity and complexity for commercial builders and multifamily developers.
Understanding what’s still available (and how to access it) is important. For instance, the once-reliable 179D deduction and 45L credit are on the chopping block after mid-2026, while new restrictions limit eligibility for key business credits like 48E and 45Y. Meanwhile, programs like the Residential Clean Energy Credit remain in place through 2032, but with modified terms.
If you’re a developer planning projects for 2026, these tax credits are likely to shape your capital stack, project timelines, and even construction specs. The trick is knowing what’s available, what’s phasing out, and how to qualify.
In this guide, we’ll break down everything you need to know about green building tax credits for developers in 2025—from eligibility and compliance, to updates under the OBBBA, to how you can proactively secure these incentives before they disappear.
Table of Contents
- The landscape of green building incentives
- What is the 45L Energy Efficient Home Credit?
- The 179D Commercial Building Deduction
- Key changes under the Inflation Reduction Act (IRA)
- What the One Big Beautiful Bill Act (OBBBA) repeals and modifies
- Fuel cell and battery storage credits
- Tax planning strategies for developers
- Navigating FEOC restrictions and compliance
- Maximizing return with proper documentation
- Building a greener, smarter future
The landscape of green building incentives
In 2025, green building tax incentives are no longer fringe policies, they are central tools for developers, investors, and contractors aiming to deliver cost-effective, sustainable buildings. The Inflation Reduction Act (IRA), initially passed in 2022, ushered in a new era of climate-friendly tax policy. For developers, credits such as the 45L and 179D have been game changers, allowing substantial financial offsets for building energy-efficient homes and commercial properties.
But 2025 also brings disruption. The One Big Beautiful Bill Act (OBBBA), passed earlier this year, significantly alters many provisions introduced by the IRA. While some credits remain in place (though modified), others—including those most relevant to residential developers—face full repeal by the end of 2025 or mid-2026.
The stakes are high. With climate targets pressing and federal subsidies shifting, developers must act swiftly.
What is the 45L Energy Efficient Home Credit?
Section 45L of the Internal Revenue Code allows eligible developers to claim up to $5,000 per qualifying home acquired between January 1, 2023 and December 31, 2032. This credit specifically targets residential new construction and substantial reconstructions that meet high energy-efficiency standards.
Eligible projects
- Single-family homes
- Multifamily properties
- Manufactured homes
Requirements
- The home must meet ENERGY STAR or DOE Zero Energy Ready standards
- It must be acquired (sold or leased) as a residence within the eligible time period
- Builders must meet prevailing wage and apprenticeship requirements to receive the full $5,000 credit
Originally set at $2,000 or less per unit, the 45L credit was expanded under the IRA to support developers building higher-efficiency residential properties.
IRS Form 8908—Energy Efficient Home Credit.
Status in 2025
Due to the OBBBA, this credit is scheduled to be repealed after June 30, 2026. That means developers with qualifying 2025 builds have a window of opportunity—construction and acquisition must occur before this sunset to qualify.
The 179D Commercial Building Deduction
Section 179D offers a tax deduction of up to $5.00 per square foot for energy-efficient commercial building systems. This deduction applies to:
- Lighting
- HVAC and hot water systems
- Building envelope improvements
Who can claim it?
- Commercial building owners
- Designers of tax-exempt government or non-profit buildings (e.g., schools, hospitals)
The IRA expanded this deduction, particularly through bonus tiers linked to:
- Prevailing wage and apprenticeship requirements
- Projects located in low-income or energy communities
2025 changes
OBBBA repeals the 179D deduction after June 30, 2026. Developers must complete qualifying work before that date to benefit.
Key changes under the Inflation Reduction Act (IRA)
The IRA’s original intent was to dramatically scale up green construction by expanding:
- Credit values
- Eligible technologies
- Applicability to multifamily and tax-exempt entities
Notable provisions included:
- Battery storage technology became eligible (from 2023 onward)
- Wage and apprenticeship bonuses increased incentive values
- Enhanced direct pay and transferability of credits
These expansions led to an influx of developers entering green markets. However, the complex two-tier system (base credit vs. bonus credit) proved difficult to navigate, especially for smaller firms.
What the One Big Beautiful Bill Act (OBBBA) repeals and modifies
The OBBBA introduced sweeping changes.
Full repeals
- Section 45L Credit – ends June 30, 2026
- Section 179D Deduction – ends June 30, 2026
- Residential Clean Energy Credit – ends December 31, 2025
- New Energy Efficient Home Improvement Credit (25C) – ends December 31, 2025
Phaseouts and restrictions
- Clean Electricity Credits (45Y, 48E) phased out unless projects begin within 12 months of passage
- Foreign Entity of Concern (FEOC) Restrictions apply to several credits
Impact
For developers, this means accelerated timelines, reduced long-term support, and more stringent compliance requirements.
Fuel cell and battery storage credits
If you’re developing homes or buildings that integrate clean tech beyond solar, other credits may apply—though with caveats.
Fuel Cell Credit
- Limited to $500 per half kilowatt of capacity
- Applies only to primary residences
Battery storage
- Became eligible under IRA in 2023
- Must be paired with renewable generation (e.g., solar)
These credits are also scheduled for repeal or major restriction under OBBBA, making 2025 a critical window to claim them.
Tax planning strategies for developers
1. Secure incentives before phaseouts
Begin or complete projects before June 30, 2026, to lock in 45L or 179D benefits.
2. Focus on documentation
Maintain third-party certifications (ENERGY STAR, ZERH), wage compliance logs, and installation receipts.
3. Consider transferability
Explore credit transfers if you’re unable to utilize the full deduction—especially helpful for early-stage developers or syndicators.
4. Leverage combo incentives
Where possible, combine 45L with state/local green building incentives.
Navigating FEOC restrictions and compliance
One of the most complex additions in 2025 is the FEOC (Foreign Entity of Concern) clause. Under this rule:
- Any project using materials or components from China, Russia, Iran, or North Korea may be ineligible for tax credits
- This restriction applies across production, material sourcing, and ownership stakes
Developer tip
Request documentation from all suppliers and manufacturers regarding country of origin and ownership to avoid credit disqualification.
Maximizing return with proper documentation
Good documentation is both smart and essential.
Make sure you:
- Retain purchase orders, contractor agreements, and installation proof
- Confirm your project meets ENERGY STAR or ZERH certification for residential builds
- Verify prevailing wage and apprenticeship records where applicable
- Record compliance with FEOC and OBBBA requirements
The IRS is tightening scrutiny around energy tax claims. A strong paper trail ensures your audit risk stays low while maximizing your credit potential.
Building a greener, smarter future
2025 is both a moment of opportunity and urgency for developers committed to sustainability. The expanded credits of the IRA still apply—but only for a limited time. The upcoming OBBBA repeals add pressure to act quickly, plan strategically, and document rigorously.
These credits won’t just reduce your tax burden, they offer long-term ROI in energy efficiency, marketability, and regulatory goodwill.
At Harness, we help developers across the U.S. navigate the evolving tax landscape for green buildings. Whether you’re pursuing 45L credits for a multifamily build or want clarity on FEOC restrictions, our team is here to support you.
Ready to optimize your next green development project?
Get started with Harness today.
Disclaimer:
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